User manual

36
CHROMIS USER MANUAL

NOTE: when the no repetitive dive
symbol is on, the planner on the top
row initially shows the time period
when diving would be allowed again.
For planning the altitude excursion the
interval time can be reduced, which
causes the prohibited altitude level to
decrease.
Chromis has an altitude warning: if you
were to reach an altitude that according to
Chromis is incompatible with your current
residual nitrogen levels, it will warn you with
an altitude warning.
4.7.5.4 Decompression dives in
mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
2m/7ft stage and a 4m/13ft stage in
altitude ranges 1, 2 and 3.
If atmospheric pressure is below 610mbar
(altitude higher than 4000m/13300ft), no
decompression calculation is carried out
by Chromis (automatic GAUGE mode). In
addition, the dive planner is not available in
this altitude class.
4.7.6 Warnings and alarms
Chromis can alert you of potentially
dangerous situations via warnings and
alarms. You can only modify the warning
and alarm settings via PC interface.
Warnings represent situations that require
the diver’s attention, but ignoring them
does not represent an immediate risk. It is
up to you to decide which ones you would
like to be active and which ones not. The
available warnings are:
4.7.6.1 CNS O
2
= 75%
Chromis tracks your oxygen uptake via the
CNS O
2
clock. If the calculated value of
CNS O
2
reaches 75%, Chromis will emit a
sequence of audible beeps for 12 seconds
and the % symbol will be blinking in the top
right corner. The blinking will continue until
the value of CNS O
2
drops under 75%.
4.7.6.2 No-Stop time = 2 minutes
If you wish to avoid unintentionally
performing a decompression dive, Chromis
can activate a warning when the no-stop
time reaches 2 minutes. This applies to
current selected MB level no-stop time (see
chapter Diving with MB levels for more
information on MB level diving). It gives you
the opportunity to start ascending before
incurring a decompression stop or a level
stop obligation.
Chromis emits a sequence of audible
beeps for 12 seconds and the no-stop time
will blink. The blinking will continue until you
ascend suffi ciently for the no-stop time to
grow to 6 minutes, or until Chromis enters
into decompression.
4.7.6.3 Entering decompression
Chromis can activate a warning when
the fi rst mandatory decompression stop
appears. This alerts the diver to the fact
that a direct ascent to the surface is no
longer possible.
When the no-stop time ends and a
mandatory stop is required before reaching